package test2;

/**
 * @author oldliu
 * @since 1.0
 */
@FunctionalInterface
public interface MathF {
    public int operate(int a,int b);

    public default int mul(int a,int b){
        return a*b;
    }
    public default int lifang(int a){
        return a*a*a;
    }
}
